16253955081 has 81 divisors (see below), whose sum is σ = 29636984871. Its totient is φ = 8555156064.

The previous prime is 16253955079. The next prime is 16253955121. The reversal of 16253955081 is 18055935261.

The square root of 16253955081 is 127491.

It is a perfect power (a square), and thus also a powerful number.

16253955081 is a `hidden beast` number, since 1 + 6 + 2 + 53 + 95 + 508 + 1 = 666.

16253955081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2404431225 + 13849523856 = 49035^2 + 117684^2 .

It is not a de Polignac number, because 16253955081 - 2¹ = 16253955079 is a prime.

It is a super-2 number, since 2×16253955081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16253955001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 34804810 + ... + 34805276.

Almost surely, 2^16253955081 is an apocalyptic number.

16253955081 is the 127491-st square number.

16253955081 is the 63746-th centered octagonal number.

It is an amenable number.

16253955081 is a deficient number, since it is larger than the sum of its proper divisors (13383029790).

16253955081 is an equidigital number, since it uses as much as digits as its factorization.

16253955081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 16253955081 in words is "sixteen billion, two hundred fifty-three million, nine hundred fifty-five thousand, eighty-one".